X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fs390%2Fkernel%2Fentry64.S;h=51527ab8c8f974b646fe92e599fc513fefc869d3;hb=6a77f38946aaee1cd85eeec6cf4229b204c15071;hp=e94e694d512cd7bd7cd40835e087336799cdf2d5;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index e94e694d5..51527ab8c 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -19,12 +19,14 @@ #include #include #include +#include /* * Stack layout for the system_call stack entry. * The first few entries are identical to the user_regs_struct. */ -SP_PTREGS = STACK_FRAME_OVERHEAD +SP_PTREGS = STACK_FRAME_OVERHEAD +SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 @@ -47,9 +49,30 @@ SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE -_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_RESTART_SVC) +STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER +STACK_SIZE = 1 << STACK_SHIFT + +_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ + _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) +#define BASED(name) name-system_call(%r13) + + .macro STORE_TIMER lc_offset +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + stpt \lc_offset +#endif + .endm + +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + .macro UPDATE_VTIME lc_from,lc_to,lc_sum + lg %r10,\lc_from + slg %r10,\lc_to + alg %r10,\lc_sum + stg %r10,\lc_sum + .endm +#endif + /* * Register usage in interrupt handlers: * R9 - pointer to current task structure @@ -58,99 +81,59 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) * R15 - kernel stack pointer */ + .macro SAVE_ALL_BASE savearea + stmg %r12,%r15,\savearea + larl %r13,system_call + .endm + .macro SAVE_ALL psworg,savearea,sync - stmg %r13,%r15,\savearea + la %r12,\psworg .if \sync - tm \psworg+1,0x01 # test problem state bit - jz 1f # skip stack setup save - lg %r15,__LC_KERNEL_STACK # problem state -> load ksp + tm \psworg+1,0x01 # test problem state bit + jz 2f # skip stack setup save + lg %r15,__LC_KERNEL_STACK # problem state -> load ksp .else - tm \psworg+1,0x01 # test problem state bit - jnz 0f # from user -> load kernel stack - lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? + tm \psworg+1,0x01 # test problem state bit + jnz 1f # from user -> load kernel stack + clc \psworg+8(8),BASED(.Lcritical_end) + jhe 0f + clc \psworg+8(8),BASED(.Lcritical_start) + jl 0f + brasl %r14,cleanup_critical + tm 0(%r12),0x01 # retest problem state after cleanup + jnz 1f +0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? slgr %r14,%r15 - srag %r14,%r14,14 - jz 1f -0: lg %r15,__LC_ASYNC_STACK # load async stack + srag %r14,%r14,STACK_SHIFT + jz 2f +1: lg %r15,__LC_ASYNC_STACK # load async stack .endif -1: aghi %r15,-SP_SIZE # make room for registers & psw - lghi %r14,\psworg - slgr %r13,%r13 - icm %r14,12,__LC_SVC_ILC - stmg %r0,%r12,SP_R0(%r15) # store gprs 0-13 to kernel stack - stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 - mvc SP_R13(24,%r15),\savearea # move r13, r14 and r15 to stack - mvc SP_PSW(16,%r15),\psworg # move user PSW to stack - st %r14,SP_ILC(%r15) - stg %r13,0(%r15) +#ifdef CONFIG_CHECK_STACK + j 3f +2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD + jz stack_overflow +3: +#endif +2: aghi %r15,-SP_SIZE # make room for registers & psw + mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack + la %r12,\psworg + stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 + icm %r12,12,__LC_SVC_ILC + stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack + st %r12,SP_ILC(%r15) + mvc SP_R12(32,%r15),\savearea # move %r12-%r15 to stack + la %r12,0 + stg %r12,__SF_BACKCHAIN(%r15) .endm - .macro CLEANUP_SAVE_ALL psworg,savearea,sync - lg %r1,SP_PSW+8(%r15) - cli 1(%r1),0xdf - jne 2f - mvc \savearea(24),SP_R13(%r15) -2: lg %r1,\savearea+16 - .if \sync - tm \psworg+1,0x01 - jz 1f - lg %r1,__LC_KERNEL_STACK - .else - tm \psworg+1,0x01 - jnz 0f - lg %r0,__LC_ASYNC_STACK - slgr %r0,%r1 - srag %r0,%r0,14 - jz 1f -0: lg %r1,__LC_ASYNC_STACK + .macro RESTORE_ALL sync + mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore + .if !\sync + ni __LC_RETURN_PSW+1,0xfd # clear wait state bit .endif -1: aghi %r1,-SP_SIZE - stg %r1,SP_R15(%r15) - lghi %r0,\psworg - xc SP_R13(8,%r15),SP_R13(%r15) - icm %r0,12,__LC_SVC_ILC - stg %r0,SP_R14(%r15) - mvc SP_R0(104,%r1),SP_R0(%r15) - mvc SP_ORIG_R2(8,%r1),SP_R2(%r15) - mvc SP_R13(24,%r1),\savearea - mvc SP_PSW(16,%r1),\psworg - st %r0,SP_ILC(%r1) - xc 0(8,%r1),0(%r1) - .endm - - .macro RESTORE_ALL # system exit macro - mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore - ni __LC_RETURN_PSW+1,0xfd # clear wait state bit - lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user - lpswe __LC_RETURN_PSW # back to caller - .endm - - .macro CLEANUP_RESTORE_ALL - lg %r1,SP_PSW+8(%r15) - cli 0(%r1),0xb2 - jne 0f - mvc SP_PSW(16,%r15),__LC_RETURN_PSW - j 1f -0: lg %r1,SP_R15(%r15) - mvc SP_PSW(16,%r15),SP_PSW(%r1) - mvc SP_R0(128,%r15),SP_R0(%r1) -1: - .endm - - .macro GET_THREAD_INFO - lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct - .endm - - .macro CHECK_CRITICAL - tm SP_PSW+1(%r15),0x01 # test problem state bit - jnz 0f # from user -> not critical - larl %r1,.Lcritical_start - clc SP_PSW+8(8,%r15),8(%r1) # compare ip with __critical_end - jnl 0f - clc SP_PSW+8(8,%r15),0(%r1) # compare ip with __critical_start - jl 0f - brasl %r14,cleanup_critical -0: + lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user + STORE_TIMER __LC_EXIT_TIMER + lpswe __LC_RETURN_PSW # back to caller .endm /* @@ -164,43 +147,23 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) __switch_to: tm __THREAD_per+4(%r3),0xe8 # is the new process using per ? jz __switch_to_noper # if not we're fine - stctg %c9,%c11,48(%r15) # We are using per stuff - clc __THREAD_per(24,%r3),48(%r15) + stctg %c9,%c11,__SF_EMPTY(%r15)# We are using per stuff + clc __THREAD_per(24,%r3),__SF_EMPTY(%r15) je __switch_to_noper # we got away without bashing TLB's lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't __switch_to_noper: - stmg %r6,%r15,48(%r15) # store __switch_to registers of prev task + stmg %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp - lmg %r6,%r15,48(%r15) # load __switch_to registers of next task + lmg %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct + lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 lg %r3,__THREAD_info(%r3) # load thread_info from task struct stg %r3,__LC_THREAD_INFO - aghi %r3,16384 + aghi %r3,STACK_SIZE stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack br %r14 -/* - * do_softirq calling function. We want to run the softirq functions on the - * asynchronous interrupt stack. - */ - .global do_call_softirq -do_call_softirq: - stnsm 48(%r15),0xfc - stmg %r12,%r15,56(%r15) - lgr %r12,%r15 - lg %r0,__LC_ASYNC_STACK - slgr %r0,%r15 - srag %r0,%r0,14 - je 0f - lg %r15,__LC_ASYNC_STACK -0: aghi %r15,-STACK_FRAME_OVERHEAD - stg %r12,0(%r15) # store back chain - brasl %r14,do_softirq - lmg %r12,%r15,56(%r12) - ssm 48(%r15) - br %r14 - __critical_start: /* * SVC interrupt handler routine. System calls are synchronous events and @@ -209,18 +172,32 @@ __critical_start: .globl system_call system_call: + STORE_TIMER __LC_SYNC_ENTER_TIMER +sysc_saveall: + SAVE_ALL_BASE __LC_SAVE_AREA SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore -sysc_enter: - GET_THREAD_INFO # load pointer to task_struct to R9 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +sysc_vtime: + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz sysc_do_svc + UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER +sysc_stime: + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER +sysc_update: + mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER +#endif +sysc_do_svc: + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct slag %r7,%r7,2 # *4 and test for svc 0 - jnz sysc_do_restart + jnz sysc_nr_ok # svc 0: system call number in %r1 - lghi %r0,NR_syscalls - clr %r1,%r0 - jnl sysc_do_restart + cl %r1,BASED(.Lnr_syscalls) + jnl sysc_nr_ok lgfr %r7,%r1 # clear high word in r1 slag %r7,%r7,2 # svc 0: system call number in %r1 +sysc_nr_ok: + mvc SP_ARGS(8,%r15),SP_R7(%r15) sysc_do_restart: larl %r10,sys_call_table #ifdef CONFIG_S390_SUPPORT @@ -231,7 +208,7 @@ sysc_noemu: #endif tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) lgf %r8,0(%r7,%r10) # load address of system call routine - jo sysc_tracesys + jnz sysc_tracesys basr %r14,%r8 # call sys_xxxx stg %r2,SP_R2(%r15) # store return value (change R2 on stack) # ATTENTION: check sys_execve_glue before @@ -243,18 +220,16 @@ sysc_return: tm __TI_flags+7(%r9),_TIF_WORK_SVC jnz sysc_work # there is work to do (signals etc.) sysc_leave: - RESTORE_ALL + RESTORE_ALL 1 # # recheck if there is more work to do # sysc_work_loop: - GET_THREAD_INFO # load pointer to task_struct to R9 tm __TI_flags+7(%r9),_TIF_WORK_SVC jz sysc_leave # there is no work to do # # One of the work bits is on. Find out which one. -# Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED # sysc_work: tm __TI_flags+7(%r9),_TIF_NEED_RESCHED @@ -263,6 +238,8 @@ sysc_work: jo sysc_sigpending tm __TI_flags+7(%r9),_TIF_RESTART_SVC jo sysc_restart + tm __TI_flags+7(%r9),_TIF_SINGLE_STEP + jo sysc_singlestep j sysc_leave # @@ -276,11 +253,14 @@ sysc_reschedule: # _TIF_SIGPENDING is set, call do_signal # sysc_sigpending: + ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP la %r2,SP_PTREGS(%r15) # load pt_regs sgr %r3,%r3 # clear *oldset brasl %r14,do_signal # call do_signal tm __TI_flags+7(%r9),_TIF_RESTART_SVC jo sysc_restart + tm __TI_flags+7(%r9),_TIF_SINGLE_STEP + jo sysc_singlestep j sysc_leave # out of here, do NOT recheck # @@ -294,6 +274,18 @@ sysc_restart: lmg %r2,%r6,SP_R2(%r15) # load svc arguments j sysc_do_restart # restart svc +# +# _TIF_SINGLE_STEP is set, call do_single_step +# +sysc_singlestep: + ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP + lhi %r0,__LC_PGM_OLD_PSW + sth %r0,SP_TRAP(%r15) # set trap indication to pgm check + la %r2,SP_PTREGS(%r15) # address of register-save area + larl %r14,sysc_return # load adr. of system return + jg do_single_step # branch to do_sigtrap + + __critical_end: # @@ -319,7 +311,7 @@ sysc_tracego: stg %r2,SP_R2(%r15) # store return value sysc_tracenogo: tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) - jno sysc_return + jz sysc_return la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,1 larl %r14,sysc_return # return point is sysc_return @@ -329,9 +321,13 @@ sysc_tracenogo: # a new process exits the kernel with ret_from_fork # .globl ret_from_fork -ret_from_fork: - GET_THREAD_INFO # load pointer to task_struct to R9 - brasl %r14,schedule_tail +ret_from_fork: + lg %r13,__LC_SVC_NEW_PSW+8 + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? + jo 0f + stg %r15,SP_R15(%r15) # store stack pointer for new kthread +0: brasl %r14,schedule_tail stosm 24(%r15),0x03 # reenable interrupts j sysc_return @@ -473,14 +469,25 @@ pgm_check_handler: * we just ignore the PER event (FIXME: is there anything we have to do * for LPSW?). */ + STORE_TIMER __LC_SYNC_ENTER_TIMER + SAVE_ALL_BASE __LC_SAVE_AREA tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception jnz pgm_per # got per exception -> special case SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz pgm_no_vtime + UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER +pgm_no_vtime: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct lgf %r3,__LC_PGM_ILC # load program interruption code lghi %r8,0x7f ngr %r8,%r3 +pgm_do_call: sll %r8,3 - GET_THREAD_INFO larl %r1,pgm_check_table lg %r1,0(%r8,%r1) # load address of handler routine la %r2,SP_PTREGS(%r15) # address of register-save area @@ -497,6 +504,7 @@ pgm_per: clc __LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW je pgm_svcper # no interesting special case, ignore PER event + lmg %r12,%r15,__LC_SAVE_AREA lpswe __LC_PGM_OLD_PSW # @@ -504,107 +512,67 @@ pgm_per: # pgm_per_std: SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1 - GET_THREAD_INFO - mvc __THREAD_per+__PER_atmid(2,%r9),__LC_PER_ATMID - mvc __THREAD_per+__PER_address(8,%r9),__LC_PER_ADDRESS - mvc __THREAD_per+__PER_access_id(1,%r9),__LC_PER_ACCESS_ID - lghi %r4,0x7f +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz pgm_no_vtime2 + UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER +pgm_no_vtime2: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + lg %r1,__TI_task(%r9) + mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID + mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS + mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID + oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP lgf %r3,__LC_PGM_ILC # load program interruption code - nr %r4,%r3 # clear per-event-bit and ilc - je pgm_per_only # only per of per+check ? - sll %r4,3 - larl %r1,pgm_check_table - lg %r1,0(%r4,%r1) # load address of handler routine - la %r2,SP_PTREGS(%r15) # address of register-save area - basr %r14,%r1 # branch to interrupt-handler -pgm_per_only: - la %r2,SP_PTREGS(15) # address of register-save area - larl %r14,sysc_return # load adr. of system return - jg do_debugger_trap + lghi %r8,0x7f + ngr %r8,%r3 # clear per-event-bit and ilc + je sysc_return + j pgm_do_call # # it was a single stepped SVC that is causing all the trouble # pgm_svcper: SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 - llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore - stosm 48(%r15),0x03 # reenable interrupts - GET_THREAD_INFO # load pointer to task_struct to R9 - mvc __THREAD_per+__PER_atmid(2,%r9),__LC_PER_ATMID - mvc __THREAD_per+__PER_address(8,%r9),__LC_PER_ADDRESS - mvc __THREAD_per+__PER_access_id(1,%r9),__LC_PER_ACCESS_ID - slag %r7,%r7,2 # *4 and test for svc 0 - jnz pgm_svcstd - # svc 0: system call number in %r1 - lghi %r0,NR_syscalls - clr %r1,%r0 - slag %r7,%r1,2 -pgm_svcstd: - larl %r10,sys_call_table -#ifdef CONFIG_S390_SUPPORT - tm SP_PSW+3(%r15),0x01 # are we running in 31 bit mode ? - jo pgm_svcper_noemu - larl %r10,sys_call_table_emu # use 31 bit emulation system calls -pgm_svcper_noemu: +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz pgm_no_vtime3 + UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER +pgm_no_vtime3: #endif - tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) - lgf %r8,0(%r7,%r10) # load address of system call routine - jo pgm_tracesys - basr %r14,%r8 # call sys_xxxx - stg %r2,SP_R2(%r15) # store return value (change R2 on stack) - # ATTENTION: check sys_execve_glue before - # changing anything here !! - -pgm_svcret: - tm __TI_flags+7(%r9),_TIF_SIGPENDING - jno pgm_svcper_nosig - la %r2,SP_PTREGS(%r15) # load pt_regs - sgr %r3,%r3 # clear *oldset - brasl %r14,do_signal - -pgm_svcper_nosig: - lhi %r0,__LC_PGM_OLD_PSW # set trap indication back to pgm_chk - st %r0,SP_TRAP(%r15) - la %r2,SP_PTREGS(15) # address of register-save area - larl %r14,sysc_return # load adr. of system return - jg do_debugger_trap -# -# call trace before and after sys_call -# -pgm_tracesys: - la %r2,SP_PTREGS(%r15) # load pt_regs - la %r3,0 - srlg %r7,%r7,2 - stg %r7,SP_R2(%r15) - brasl %r14,syscall_trace - lghi %r0,NR_syscalls - clg %r0,SP_R2(%r15) - jnh pgm_svc_nogo - lg %r7,SP_R2(%r15) - sllg %r7,%r7,2 # strace wants to change the syscall - lgf %r8,0(%r7,%r10) -pgm_svc_go: - lmg %r3,%r6,SP_R3(%r15) - lg %r2,SP_ORIG_R2(%r15) - basr %r14,%r8 # call sys_xxx - stg %r2,SP_R2(%r15) # store return value -pgm_svc_nogo: - tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) - jno pgm_svcret - la %r2,SP_PTREGS(%r15) # load pt_regs - la %r3,1 - larl %r14,pgm_svcret # return point is sysc_return - jg syscall_trace + llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + lg %r1,__TI_task(%r9) + mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID + mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS + mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID + oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + j sysc_do_svc /* * IO interrupt handler routine */ .globl io_int_handler io_int_handler: - SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0 + STORE_TIMER __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK - CHECK_CRITICAL - GET_THREAD_INFO # load pointer to task_struct to R9 + SAVE_ALL_BASE __LC_SAVE_AREA+32 + SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz io_no_vtime + UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER +io_no_vtime: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct la %r2,SP_PTREGS(%r15) # address of register-save area brasl %r14,do_IRQ # call standard irq handler @@ -618,7 +586,7 @@ io_return: tm __TI_flags+7(%r9),_TIF_WORK_INT jnz io_work # there is work to do (signals etc.) io_leave: - RESTORE_ALL + RESTORE_ALL 0 #ifdef CONFIG_PREEMPT io_preempt: @@ -628,17 +596,16 @@ io_preempt: lg %r1,SP_R15(%r15) aghi %r1,-SP_SIZE mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc 0(8,%r1),0(%r1) # clear back chain + xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain lgr %r15,%r1 io_resume_loop: tm __TI_flags+7(%r9),_TIF_NEED_RESCHED jno io_leave larl %r1,.Lc_pactive mvc __TI_precount(4,%r9),0(%r1) - stosm 48(%r15),0x03 # reenable interrupts + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts brasl %r14,schedule # call schedule - stnsm 48(%r15),0xfc # disable I/O and ext. interrupts - GET_THREAD_INFO # load pointer to task_struct to R9 + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts xc __TI_precount(4,%r9),__TI_precount(%r9) j io_resume_loop #endif @@ -650,7 +617,7 @@ io_work: lg %r1,__LC_KERNEL_STACK aghi %r1,-SP_SIZE mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc 0(8,%r1),0(%r1) # clear back chain + xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain lgr %r15,%r1 # # One of the work bits is on. Find out which one. @@ -667,34 +634,42 @@ io_work_loop: # _TIF_NEED_RESCHED is set, call schedule # io_reschedule: - stosm 48(%r15),0x03 # reenable interrupts - brasl %r14,schedule # call scheduler - stnsm 48(%r15),0xfc # disable I/O and ext. interrupts - GET_THREAD_INFO # load pointer to task_struct to R9 + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + brasl %r14,schedule # call scheduler + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts tm __TI_flags+7(%r9),_TIF_WORK_INT - jz io_leave # there is no work to do + jz io_leave # there is no work to do j io_work_loop # # _TIF_SIGPENDING is set, call do_signal # io_sigpending: - stosm 48(%r15),0x03 # reenable interrupts - la %r2,SP_PTREGS(%r15) # load pt_regs - slgr %r3,%r3 # clear *oldset - brasl %r14,do_signal # call do_signal - stnsm 48(%r15),0xfc # disable I/O and ext. interrupts - j sysc_leave # out of here, do NOT recheck + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + la %r2,SP_PTREGS(%r15) # load pt_regs + slgr %r3,%r3 # clear *oldset + brasl %r14,do_signal # call do_signal + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + j sysc_leave # out of here, do NOT recheck /* * External interrupt handler routine */ .globl ext_int_handler ext_int_handler: - SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0 - CHECK_CRITICAL - GET_THREAD_INFO # load pointer to task_struct to R9 + STORE_TIMER __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK + SAVE_ALL_BASE __LC_SAVE_AREA+32 + SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz ext_no_vtime + UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER +ext_no_vtime: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct la %r2,SP_PTREGS(%r15) # address of register-save area llgh %r3,__LC_EXT_INT_CODE # get interruption code brasl %r14,do_extint @@ -705,10 +680,20 @@ ext_int_handler: */ .globl mcck_int_handler mcck_int_handler: + STORE_TIMER __LC_ASYNC_ENTER_TIMER + SAVE_ALL_BASE __LC_SAVE_AREA+64 SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64,0 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz mcck_no_vtime + UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER +mcck_no_vtime: +#endif brasl %r14,s390_do_machine_check mcck_return: - RESTORE_ALL + RESTORE_ALL 0 #ifdef CONFIG_SMP /* @@ -721,8 +706,8 @@ restart_int_handler: lctlg %c0,%c15,0(%r10) # get new ctl regs lghi %r10,__LC_AREGS_SAVE_AREA lam %a0,%a15,0(%r10) - stosm 0(%r15),0x04 # now we can turn dat on - lmg %r6,%r15,48(%r15) # load registers from clone + lmg %r6,%r15,__SF_GPRS(%r15) # load registers from clone + stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on jg start_secondary #else /* @@ -739,46 +724,129 @@ restart_crash: restart_go: #endif -cleanup_table: - .quad system_call, sysc_enter, cleanup_sysc_enter - .quad sysc_return, sysc_leave, cleanup_sysc_return - .quad sysc_leave, sysc_work_loop, cleanup_sysc_leave - .quad sysc_work_loop, sysc_reschedule, cleanup_sysc_return -cleanup_table_entries=(.-cleanup_table) / 24 +#ifdef CONFIG_CHECK_STACK +/* + * The synchronous or the asynchronous stack overflowed. We are dead. + * No need to properly save the registers, we are going to panic anyway. + * Setup a pt_regs so that show_trace can provide a good call trace. + */ +stack_overflow: + lg %r15,__LC_PANIC_STACK # change to panic stack + aghi %r1,-SP_SIZE + mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack + stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack + la %r1,__LC_SAVE_AREA + chi %r12,__LC_SVC_OLD_PSW + je 0f + chi %r12,__LC_PGM_OLD_PSW + je 0f + la %r1,__LC_SAVE_AREA+16 +0: mvc SP_R12(32,%r15),0(%r1) # move %r12-%r15 to stack + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain + la %r2,SP_PTREGS(%r15) # load pt_regs + jg kernel_stack_overflow +#endif + +cleanup_table_system_call: + .quad system_call, sysc_do_svc +cleanup_table_sysc_return: + .quad sysc_return, sysc_leave +cleanup_table_sysc_leave: + .quad sysc_leave, sysc_work_loop +cleanup_table_sysc_work_loop: + .quad sysc_work_loop, sysc_reschedule cleanup_critical: - lghi %r0,cleanup_table_entries - larl %r1,cleanup_table - lg %r2,SP_PSW+8(%r15) -cleanup_loop: - clg %r2,0(%r1) - jl cleanup_cont - clg %r2,8(%r1) - jl cleanup_found -cleanup_cont: - la %r1,24(%r1) - brct %r0,cleanup_loop + clc 8(8,%r12),BASED(cleanup_table_system_call) + jl 0f + clc 8(8,%r12),BASED(cleanup_table_system_call+8) + jl cleanup_system_call +0: + clc 8(8,%r12),BASED(cleanup_table_sysc_return) + jl 0f + clc 8(8,%r12),BASED(cleanup_table_sysc_return+8) + jl cleanup_sysc_return +0: + clc 8(8,%r12),BASED(cleanup_table_sysc_leave) + jl 0f + clc 8(8,%r12),BASED(cleanup_table_sysc_leave+8) + jl cleanup_sysc_leave +0: + clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop) + jl 0f + clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop+8) + jl cleanup_sysc_leave +0: br %r14 -cleanup_found: - lg %r1,16(%r1) - br %r1 - -cleanup_sysc_enter: - CLEANUP_SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 - llgh %r0,0x8a - stg %r0,SP_R7(%r15) - larl %r1,sysc_enter - stg %r1,SP_PSW+8(%r15) + +cleanup_system_call: + mvc __LC_RETURN_PSW(16),0(%r12) +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8) + jh 0f + mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER +0: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16) + jhe cleanup_vtime +#endif + clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn) + jh 0f + mvc __LC_SAVE_AREA(32),__LC_SAVE_AREA+32 +0: stg %r13,__LC_SAVE_AREA+40 + SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 + stg %r15,__LC_SAVE_AREA+56 + llgh %r7,__LC_SVC_INT_CODE +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +cleanup_vtime: + clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24) + jhe cleanup_stime + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz cleanup_novtime + UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER +cleanup_stime: + clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32) + jh cleanup_update + UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER +cleanup_update: + mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER +cleanup_novtime: +#endif + mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8) + la %r12,__LC_RETURN_PSW br %r14 +cleanup_system_call_insn: + .quad sysc_saveall +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + .quad system_call + .quad sysc_vtime + .quad sysc_stime + .quad sysc_update +#endif cleanup_sysc_return: - larl %r1,sysc_return - stg %r1,SP_PSW+8(%r15) + mvc __LC_RETURN_PSW(8),0(%r12) + mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return) + la %r12,__LC_RETURN_PSW br %r14 cleanup_sysc_leave: - CLEANUP_RESTORE_ALL + clc 8(8,%r12),BASED(cleanup_sysc_leave_insn) + je 0f +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER + clc 8(8,%r12),BASED(cleanup_sysc_leave_insn+8) + je 0f +#endif + mvc __LC_RETURN_PSW(16),SP_PSW(%r15) + mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) + lmg %r0,%r11,SP_R0(%r15) + lg %r15,SP_R15(%r15) +0: la %r12,__LC_RETURN_PSW br %r14 +cleanup_sysc_leave_insn: +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + .quad sysc_leave + 16 +#endif + .quad sysc_leave + 12 /* * Integer constants @@ -786,6 +854,12 @@ cleanup_sysc_leave: .align 4 .Lconst: .Lc_pactive: .long PREEMPT_ACTIVE +.Lnr_syscalls: .long NR_syscalls +.L0x0130: .short 0x130 +.L0x0140: .short 0x140 +.L0x0150: .short 0x150 +.L0x0160: .short 0x160 +.L0x0170: .short 0x170 .Lcritical_start: .quad __critical_start .Lcritical_end: